The phrase refers to a documented procedure for preparing a mixture of blueberries and other ingredients, suitable for use as the filling in a pie, and preserving it in sealed jars through a heat-processing method. This process ensures long-term storage at room temperature, preventing spoilage and preserving the filling for future use. The procedure details precise ingredient ratios, cooking instructions, and specific techniques for safely sealing and processing the jars to inhibit microbial growth.
Following tested and approved instructions ensures food safety and prevents potential health risks associated with improper preservation techniques. This practice has historical significance, representing a traditional method of preserving seasonal produce for consumption throughout the year. Benefits include having readily available pie filling, reducing food waste by preserving surplus harvests, and enjoying homemade pie fillings outside of the fresh blueberry season. Furthermore, preparing the filling offers control over ingredients and the avoidance of artificial preservatives or additives commonly found in commercially produced fillings.